Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3befdbcff0c9a74…

MALICIOUS

PDF

72.1 KB Created: 2021-09-05 07:37:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fab044812c3cbc1f970da37e2afbf2f4 SHA-1: a99c8e73af4b0fabfb5e47a8f9a8e0ac02ba01f0 SHA-256: f3befdbcff0c9a744eadfc21056cc047e67093ac08e2851cdbc25c1d1984771b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drafthe.ru/uplcv?utm_term=pension+fund+journal+pdf PDF link annotation
    • https://sealskinz.ru/files/file/mezibutuvuwesa.pdfIn PDF document text
    • http://quadocdao.vn/uploads/files/6959954927.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/a0f740434d0d30b29b55d5fa37e0fd7d/82541362100.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/52381053210.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79968560649.pdfIn PDF document text
    • http://damoorefamilyreunion.com/clients/7/71/71c8bb141a0941b69292984b9770a174/File/47797377890.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/pakalojovofoluzoloz.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/60990205054.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d743d49f6---95089598180.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/vipofizokubabegonutasa.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c51f04b8205---nonifajugomod.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/fezuxamuxor.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/31nimtuv747a3d2gp75i5ekr44/gutufapatovid.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/54065868005.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/liduzadapolodulames.pdfIn PDF document text
    • https://masihpt2.com/contents//files/modozuzuzizixizinetatik.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/sazafajedodujejugupokat.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/31b55a09abae81e9e40c19fb43a03860/zukatunudotot.pdfIn PDF document text
    • http://rhondachem.com/d/files/zigavej.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/3069989571.pdfIn PDF document text
    • http://wwsm-us.com/files/file/wabaxijukurolexirakal.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160be4f6453417---13567817161.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/b1c5d6a4e93b78412b2a15d3187ebc40/48107872683.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000baac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAAC 10624 bytes
SHA-256: d5a28d3f2a13aa920aaa4116adc79e852a1ea4fe3360652910bbaee0e2898380
font_01_sfnt_off0000d301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD301 15836 bytes
SHA-256: f28d9942131dacb3df0908f80402a9b67f8512a9ee6a4896f3a5385374d58e79
font_02_sfnt_off0000fb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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